Teaching AP DSC School Assistant 2025 Mock Test Series Mathematics Three Dimensional Geometry Angle between two lines
यदि x2 - 2pxy - y2 = 0 और x2 - 2qxy - y2 = 0 एक दूसरे के बीच समद्विविभाजक कोण है, तो
1
p + q = 1
2
pq = 1
3
pq + 1 = 0
4
p2 + pq + q2 = 0